rdoc 6.14.0 on Ruby Gems

What's Changed

Bump ruby/setup-ruby from 1.227.0 to 1.229.0 by @dependabot in #1336
Fix RDoc::Options example in README by @tompng in #1337
Bump step-security/harden-runner from 2.11.0 to 2.11.1 by @dependabot in #1338
Bump ruby/setup-ruby from 1.229.0 to 1.230.0 by @dependabot in #1339
Runs ruby-core workflow on ubuntu-latest by @st0012 in #1345
Move default RDoc headings to a constant by @vinistock in #1341
Enable Style/MethodDefParentheses rule by @vinistock in #1342
Bump ruby/setup-ruby from 1.230.0 to 1.233.0 by @dependabot in #1346
Fix rubygems hook execution when gemspec.rdoc_options contains --ri by @tompng in #1347
Update ri manpage to show how to access ruby pages by @adam12 in #1340
Fix link to CONTRIBUTING on README by @ybiquitous in #1350
Bump step-security/harden-runner from 2.11.1 to 2.12.0 by @dependabot in #1351
Bump ruby/setup-ruby from 1.233.0 to 1.235.0 by @dependabot in #1352
Don't run CI jobs for push by Dependabot by @kou in #1353
Fix typo in test name by @p8 in #1355
Polish link underline in Darkfish CSS by @ybiquitous in #1349
Rename test classes from Test* to *Test by @st0012 in #1359
Bump ruby/setup-ruby from 1.235.0 to 1.237.0 by @dependabot in #1362
Declare erb as a dependency by @st0012 in #1368
Load cgi/escape instead of cgi/util by @Earlopain in #1366
Add a new workflow to deploy page preview for PRs from forks by @st0012 in #1365
Bump version to 6.14.0 by @st0012 in #1371

Full Changelog: v6.13.1...v6.14.0